Chemical Reaction Engineering
A space velocity of 5 hr⁻¹ means that

After every 5 hours, reactor is being filled with the feed
Five reactor volumes of feed (at specified conditions) are being fed into the reactor per hour
Cent per cent conversion can be achieved in at least 5 hours
A fixed conversion of a given batch of feed takes 5 hours

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Chemical Reaction Engineering
In an ideal mixed reactor (at steady state), the

Composition throughout the reactor remains same
All of these
Exit stream has the same composition as the fluid within the reactor
Space time is equivalent to holding time for constant density systems

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Chemical Reaction Engineering
For a heterogenous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate - rA0 is invariant with total pressure. The rate controlling step is

Surface reaction between A in the gas phase and absorbed B
Surface Kc/(1 + TS) reaction between absorbed A and B in the gas phase
Desorption of C
Surface reaction between absorbed A and absorbed B

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